Mixtures of 1:2 cobalt complexes of monoazo compounds having an acetoacetanilide coupling component radical

ABSTRACT

Mixtures of symmetrical and asymmetrical 1:2 cobalt complexes of compounds of the formulae ##STR1## wherein, EACH R 1 , independently, is hydrogen or (C 1-4 )alkyl, and 
     Each R 2  and R 3 , independently, is hydrogen, halogen, (C 1-4 )alkyl or (C 1-4 )alkoxy, 
     Which complexes are optionally in salt form and which mixtures are useful for dyeing or printing substrates dyeable with anionic dyes, e.g., natural and synthetic polyamides such as wool, silk and nylon, polyurethanes, polyofefins modified to contain basic groups, leather and metals such as anodically oxidized aluminum.

The present invention relates to metal complex mixtures, their production and use.

Accordingly, the present invention provides a mixture of symmetrical and asymmetrical 1:2 cobalt complexes of the compounds of formulae I and II, ##STR2## in which compounds, EACH R₁, independently, is hydrogen or (C₁₋₄)alkyl, and

Each R₂ and R₃, independently, is hydrogen, halogen, (C₁₋₄)alkyl or (C₁₋₄)alkoxy,

Which complexes are optionally in salt form.

Preferably, the mixture contains the compounds of formulae I and II in a molar ratio range of from 80:20 to 20:80, more preferably 30:70 to 70:30, even more preferably 40:60 to 60:40, with a ration of 1:1 being most preferred.

Where any of R₁, R₂ and/or R₃ is (C₁₋₄)alkyl, such alkyl may be straight chain or branched and is preferably methyl or ethyl, with methyl being especially preferred.

Where any R₂ and/or R₃ is (C₁₋₄)alkoxy, such alkoxy is preferably methoxy or ethoxy.

By halogen is meant fluorine, chlorine or bromine. The preferred halogen is chlorine.

Preferably, the R₁ 's are R₁ ''s, where each R₁ ', independently, is hydrogen or methyl. More preferably, R₁ is hydrogen.

Preferably, the R₂ 's are R₂ ''s, where each R₂ ', independently, is hydrogen, chlorine, methyl, methoxy or ethoxy. More preferably, the R₂ 's are R₂ "'s, where each R₂ ", independently, is hydrogen, methyl, methoxy or chlorine. Most preferably, each R₂ is hydrogen.

The R₃ 's are preferably R₃ ''s, where each R₃ ', independently, has one of the significances of R₂ '. More preferably, the R₃ 's are R₃ "'s, where each R₃ ", independently, has one of the significances of R₂ ". Most preferably, each R₃ is hydrogen.

Where an R₂ /R₃ bearing phenyl ring is monosubstituted, each substituent is preferably chlorine, methyl, methoxy or ethoxy. Where a phenyl ring is disubstituted, each substituent R₂ and R₃, independently, is preferably chlorine, methyl or methoxy. The substituents are preferably in the 2,4-, 2,5-, 2,6- or 3,4-positions, with the 2,5- and 2,6-positions being most preferred.

Preferred mixtures of complexes are those in which, in the compounds of formulae I and II, the R₁ 's are R₁ ''s, the R₂ 's are R₂ ''s and the R₃ 's are R₃ ''s. More preferred mixtures are those in which, in the compounds of formulae I and II, the R₂ 's are R₂ "'s, more preferably hydrogen, and the R₃ 's are R₃ "'s, of these mixtures, those in which each R₁ is hydrogen are especially preferred. Still more preferred mixtures are those in which the R₁ 's are R₁ ''s, the R₂ 's are R₂ "'s and the R₃ 's are R₃ ''s, especially R₃ "'s; of these, those in which each R₂ is hydrogen and the R₃ 's are R₃ "'s, particularly those in which each R₁ and R₂ is hydrogen and the R₃ 's are R.sub. 3 "'s and more particularly those in which each R₁, R₂ and R₃ is hydrogen, are preferred. The most preferred mixtures in which each R₁, R₂ and R₃ is hydrogen are those formed from a mixture of compounds of formulae I and II in a 1:1 molar ratio. Most preferred mixtures are those in which R₂ is R₃ and the R₂ 's are R₂ ''s, more preferably R₂ "'s, especially hydrogen.

The present invention also provides a process for the production of a mixture of symmetrical and asymmetrical 1:2 cobalt complexes of the compounds of formulae I and II, comprising reacting a mixture of the compounds of formulae I and II with a cobalt-donating compound.

The metallisation of the mixture of monoazo compounds of formulae I and II may be carried out in accordance with conventional methods. It is preferred that the molar ratio of the mixture of compounds I and II to cobalt-donating compound is 2:1. Suitable cobalt donating compounds are cobalt(II)-sulphate, -acetate, -formate and -chloride.

It is preferred to employ the compounds of formula I and formula II in a 1:1 molar ratio.

The mixture of 1:2 cobalt complexes obtained may be isolated in accordance with known methods; for example, the product may be salted out with an alkali metal salt or a weak acid, filtered, washed with an alkali metal salt solution and dried. The product obtained contains symmetrical and asymmetrical complexes in a relationship dependent upon the ratio of the compound of formula I to that of the compound of formula II employed.

Depending on the reaction and isolation conditions, the mixture of 1:2 cobalt complexes which may be obtained may be in salt form. The complex anion-neutralising cation may be any non-chromophoric cation, for example, an alkali metal cation, such as lithium, sodium or potassium (preferably sodium); an unsubstituted, lower alkyl substituted or hydroxyalkyl substituted ammonium ion represented by the formula N.sup.⊕ (R₅)₄, where each R₅ is, independently, hydrogen, (C₁₋₃)alkyl or β-, γ- or δ-hydroxy(C₂₋₄)alkyl. It will be appreciated that groups which would cause steric or stability problems for example, tetraolkanolannonium would not be present in the complexes of the mixtures. As examples of substituted ammonium ions may be given mono-, di-, tri- and tetramethylammonium, triethanolammonium and mono-, di- and triethanolammonium. Similarly, the cation of the carboxy group may be any one of those indicated above for the complex anion-neutralizing cation and may be the same as or different therefrom. Preferably, the cation of the carboxylic acid group and the complex anion-neutralizing cation are the same; most preferably they are both sodium.

The monoazo compounds of formulae I and II are known or may be prepared in analogy with known methods from available starting materials. Preferably, the mixture of compounds of formulae I and II are prepared by diazotizing a mixture of amines of formulae III and IV, ##STR3## in the desired ratio and coupling the diazonium mixture with a compound of formula V, ##STR4## or a mixture thereof, under alkaline conditions.

The product obtained may be directly metallized.

The mixtures of 1:2 cobalt complexes according to the present invention are well soluble in water and are useful for dyeing or printing substrates dyeable with anionic dyes. Suitable substrates are natural and synthetic polyamides such as wool, silk and nylon; synthetic polyamides in the mass; polyurethanes; basic modified polyolefins; leather and metals such as anodically oxidised aluminum. The dyes are also useful for cross wound bobbin dyeing (cheese dyeing).

The mixtures according to the present invention may be employed for dyeing as such or may be made up into liquid or solid preparations.

Preferably, water-soluble organic solvents, optionally mixed with water, are used for the liquid preparations which are in the form of stable concentrated stock solutions; conventional additives such as dissolving agents (e.g. urea or alkali reacting organic or inorganic substances) may be added thereto. The stock solutions may be diluted with water. Such preparations may be made, for example, in accordance with the procedure described in German Pat. No. 1,619,470 or in German patent application No. 2,033,989. Also concentrated stable aqueous preparations which contain conventional additives may be used.

Solid preparations which are in powder or granulate form with an average particle size of at least 20μ can be used, which preparations contain conventional additives such as standardization agents. Such solid preparations may be made, for example, in accordance with the procedure described in British Pat. No. 1,370,845. The solid preparations are well soluble in water.

Further, the mixtures according to the present invention may be made up into preparations which are dispersable in cold water. For the preparation of such dispersions the dye mixture may be ground wet or dry to a particle size of less than 20μ, preferably 1-5μ, in the presence of one or more conventional anionic dispersing agents and optionally in the presence of a non-ionic dispersing agent, with or without subsequent spray drying. The preparations so obtained are finely dispersed in cold water and are thus easy to handle.

The dyestuff mixtures according to the invention give dyeings which have notable light fastness, wet fastness (wash, water, sea-water, acid- and alkali-sweat and milling fastnesses), ironing fastness, fastness to solvents, wet and dry rubbing fastness, fastness to chlorine, carbonization fastness and fastness to decatizing. The dyestuffs are not adversely affected by electrolytes or chalk.

The dyestuff mixtures according to the invention exhaust from a neutral bath and build-up well on polyamide fibres. They have generally good build-up power and build-up equally on natural and synthetic polyamides when dyed in the same dyebath. They are also suitable for dyeing in combination with other asymmetric or symmetric 1:2 metal complex dyestuffs, for example C.I. Acid Brown 363, C.I. Acid Blue 296 and C.I. Acid Green 106. The dyeings obtained with such combinations exhibit notable light fastness.

The following Examples further serve to illustrate the invention. In the Examples the temperatures are in degrees Centigrade and the parts are by weight.

EXAMPLE 1

39.6 parts of 2-amino-1-hydroxybenzene-4-sulphonic acid-N-phenylamide and 46.2 parts of 2-amino-1-hydroxybenzene-4-sulphonic acid-N-phenylamide-2'-carboxylic acid are dissolved at 65° in 700 parts water with the addition of a 30% sodium hydroxide solution and are reacted with 20.7 parts sodium nitrite. The solution, cooled to 0°-5°, is added dropwise over a period of 1 hour to 115 parts of a 30% hydrochloric acid and 80 parts of ice, the temperature being maintained at 0°-5° by the addition of further ice.

53.1 parts of acetoacetanilide are stirred to a fine suspension in 200 parts of a 20% sodium carbonate solution and are added to the diazo suspension over a period of 15 minutes. After 11/2 hours coupling is completed and the monoazo dyestuff mixture is filtered.

For metallization, the paste of the monoazo dyestuffs is stirred in 1500 parts of water and adjusted to a pH of 10 with 50 parts of a 30% sodium hydroxide solution. At a temperature of 50°-60°, a solution of 42.2 parts cobalt(II)sulphate in 150 parts water is added dropwise thereto, the pH being maintained at 10 by the addition of further sodium hydroxide. After metallization, the 1:2 cobalt complex mixture is salted out with sodium chloride, isolated by filtering, dried and ground. The dyestuff mixture obtained in the form of the sodium salt comprises complexes of a mixture of compounds (I) and (II) of general the formula ##STR5## in a 1:1 molar ratio. The mixture contains two symmetrical 1:2 cobalt complexes (a 1:2 complex of (I)/(I) and a 1:2 complex of (II)/(II)) and an asymmetrical 1:2 cobalt complex of the compounds (I) and (II).

The dyestuff mixture is well soluble in water and dyes natural and synthetic polyamide fibres in reddish-yellow shades. The dyeings have notable wet- and light-fastnesses.

In accordance with the procedure described in Example 1, further dyestuff 1:2 cobalt complex mixtures may be prepared which comprises complexes of monoazo dyes having the diazo components of compounds (I) and (II) of Example 1 and both having the same coupling component of formula V, ##STR6## in a 1:1 ratio. The significances of R₂ and R₃ and the positions of the substituents are given in Table 1. The dyestuffs give dyeings of reddish-yellow shades on natural and synthetic polyamide fibres which dyeings possess wet and light-fastnesses comparable with those of the dyeings of the dyestuff mixture of Example 1.

                  Table 1                                                          ______________________________________                                         Example No.                                                                               R.sub.2 (position)                                                                              R.sub.3 (position)                                 ______________________________________                                         2          H                Cl (2)                                             3          H                Cl (3)                                             4          H                Cl (4)                                             5          H                CH.sub.3 (3)                                       6          Cl (2)           Cl (5)                                             7          Cl (2)           CH.sub.3 (6)                                       8          H                OCH.sub.3 (2)                                      9          H                OC.sub.2 H.sub.5 (4)                               10         H                C.sub.2 H.sub.5 (2)                                11         OCH.sub.3 (2)    OCH.sub.3 (5)                                      12         OCH.sub.3 (2)    CH.sub.3 (5)                                       13         CH.sub.3 (2)     CH.sub.3 (6)                                       ______________________________________                                    

in analogous manner to the procedure described in Example 1, further 1:2 cobalt complex mixtures comprising complexes of the two monoazo dyestuffs of formulae I and II of Examples 1 to 13 in varying ratios 30:70, 70:30, 40:60, 60:40 may be prepared. The dyestuff mixtures are also water soluble and give dyeings similar to those given by the mixtures of Examples 1 to 13. Further 1:2 cobalt complex mixtures comprising complexes of compounds (I) and (II), as indicated in Table 2, may be prepared in analogy with the procedure described in Example 1. The dyestuffs are in the form of sodium salts and have good water solubility. They also give dyeings of reddish-yellow shades on natural and synthetic polyamides having notable wet and light-fastnesses.

    __________________________________________________________________________     Monoazo Compounds (I)                                                                            Monoazo Compounds (II)                                       Example R.sub.2                                                                             R.sub.3 R.sub.2                                                                             R.sub.3                                                                             Ratio                                           No.  R.sub.1                                                                           (position)                                                                          (position)                                                                          R.sub.1                                                                           (position)                                                                          (position)                                                                          (I):(II)                                        __________________________________________________________________________     14                               50:50                                         15                               40:60                                         16   CH.sub.3                                                                          H    Cl (2)                                                                              H  H    Cl (2)                                                                                60:40                                         17                               30:70                                         18                               70:30                                         19                               50:50                                         20                               45:55                                         21   H  H    H    H  H    Cl (2)                                                                                55:45                                         22                               25:75                                         23                               75:25                                         24                               40:60                                         25   CH.sub.3                                                                          H    H    H  H    Cl (2)                                                                                50:50                                         26                               60:40                                         27                               50:50                                         28    H  H    OCH.sub.3 (2)                                                                       H  H    H     35:65                                         29                               65:35                                         30                               20:80                                         31                               50:50                                         32   CH.sub.3                                                                          H    OCH.sub.3 (2)                                                                       H  H    OCH.sub.3 (2)                                                                         40:60                                         33                               60:40                                         34                               50:50                                         35                               40:60                                         36   H  H    H    H  OCH.sub.3 (2)                                                                       CH.sub.3 (5)                                                                          60:40                                         37                               35:65                                         38                               65:35                                         39                               50:50                                         40   CH.sub.3                                                                          OCH.sub.3 (2)                                                                       OCH.sub.3 (5)                                                                       H  OCH.sub.3 (2)                                                                       OCH.sub.3 (5)                                                                         25:75                                         41                               75:25                                         42                               50:50                                         43                               40:60                                         44   H  H    Cl (2)                                                                              H  H    Cl (4)                                                                                30:70                                         45                               60:40                                         46                               70:30                                         47                               50:50                                         48   H  H    Cl (2)                                                                              CH.sub.3                                                                          H    Cl (2)                                                                                30:70                                         49                               70:30                                         50                               50:50                                         51   H  H    Cl (2)                                                                              H  H    OCH.sub.3 (2)                                                                         40:60                                         52                               60:40                                         53                               50:50                                         54    H  H    H    H  Cl (2)                                                                              Cl (5)                                                                               65:35                                         55                               35:65                                         56                               30:70                                         __________________________________________________________________________

APPLICATION EXAMPLE A

1 Part of the 1:2 cobalt complex mixture of Example 1 is dissolved in 3000 parts water and 2 parts ammonium sulphate are added thereto. Subsequently, pre-moistened material (50 parts wool gaberdine or 50 parts nylon satin) is put in the bath which is heated over a period of 30 minutes to boiling temperature. The material is dyed for a further 30 minutes, any evaporated water being replaced. Subsequently, the dyed material is rinsed and after drying, a reddish-yellow dyeing having notable wet and light-fastnesses is obtained. The dyestuff mixtures of Examples 2-56 may be employed for dyeing in analogous manner.

APPLICATION EXAMPLE B

0.5 Parts of the 1:2 cobalt complex mixture of Example 1 and 0.5 parts of C.I. Acid Brown 363 are dissolved in 3000 parts of water and 2 parts aminosulphate are added thereto. Subsequently, pre-moistened material (50 parts wool gaberdine or 50 parts nylon satin) are put in the bath which is heated over a period of 30 minutes to boiling temperature. The further dyeing is carried out as described in Example A. After drying, a yellow brown dyeing having notable light and wet fastnesses is obtained.

The dyestuff mixtures of Examples 2 to 56 may be employed for combination dyeings in accordance with the same procedure.

APPLICATION EXAMPLE C

Polyamide fabric is printed with a printing paste containing:

30 parts dyestuff complex mixture of Example 1,

50 parts urea,

50 parts dissolving agent (e.g. thiodiethylene glycol),

300 parts water,

500 parts thickening agent (e.g. based on locust bean gum),

60 parts acid donating agent (ammonium tartrate), and

60 parts thiourea.

The printed textile goods are steamed for 40 minutes at 102° (saturated steam), then rinsed with cold water, washed for 5 minutes at 60° with a dilute solution of conventional detergent and rinsed again. A reddish-yellow print having notable wet and light-fastnesses is obtained.

In analogous manner printing paste may be prepared using any one of the dyestuff mixtures of Examples 2 to 56. 

What is claimed is:
 1. A mixture of symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of a compound of the formula ##STR7## and a compound of the formula ##STR8## the molar ratio of the former to the latter being 4:1 to 1:4, wherein each R₁ is independently hydrogen or C₁₋₄ alkyl,each R₂ and R₃ is independently hydrogen, halo, C₁₋₄ alkyl or C₁₋₄ alkoxy, M is hydrogen or a non-chromophoric cation, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation.
 2. A mixture according to claim 1 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 3. A mixture according to claim 1 wherein said molar ratio is 7:3 to 3:7.
 4. A mixture according to claim 3 wherein said molar ratio is 3:2 to 2:3.
 5. A mixture according to claim 4 wherein said molar ratio is 1:1.
 6. A mixture according to claim 1 wherein each R₁ is independently hydrogen or methyl.
 7. A mixture according to claim 1 wherein each R₂ is independently hydrogen, chloro, methyl, methoxy or ethoxy.
 8. A mixture according to claim 7 wherein each R₃ is independently hydrogen, chloro, methyl, methoxy or ethoxy.
 9. A mixture according to claim 8 wherein each R₁ is independently hydrogen or methyl.
 10. A mixture according to claim 9 wherein said molar ratio is 1:1.
 11. A mixture according to claim 10wherein M is hydrogen, lithium, sodium, potassium or N.sup.⊕ (R₅)₄, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen, lithium, sodium, potassium or N.sup.⊕ (R₅)₄,wherein each R₅ is independently hydrogen, C₁₋₃ alkyl or C₂₋₄ hydroxyalkyl wherein the hydroxy group is in other than the 1-position, with the proviso that at least one R₅ is hydrogen or C₁₋₃ alkyl.
 12. A mixture according to claim 11 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 13. A mixture according to claim 9 wherein each R₁ is hydrogen.
 14. A mixture according to claim 9 wherein each R₂ is independently hydrogen, chloro, methyl or methoxy.
 15. A mixture according to claim 14 wherein each R₃ is independently hydrogen, chloro, methyl or methoxy.
 16. A mixture according to claim 15 wherein each R₂ is hydrogen.
 17. A mixture according to claim 16 wherein each R₁ is hydrogen.
 18. A mixture according to claim 17 wherein each R₃ is hydrogen, chloro, methyl or methoxy, with the proviso that the two R₃ 's are identical.
 19. A mixture according to claim 18 wherein the molar ratio of the compounds of the formulae ##STR9## is 1:1.
 20. A mixture according to claim 19 of symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of the compound of the formula ##STR10## and a compound of the formula ##STR11## the molar ratio of the former to the latter being 1:1, wherein M is hydrogen or a non-chromaphoric cation, andthe negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation.
 21. A mixture according to claim 20 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 22. A mixture according to claim 19 symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of the compound of the formula ##STR12## and a compound of the formula ##STR13## the molar ratio of the former to the latter being 1:1, wherein M is hydrogen or a non-chromophoric cation, andthe negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation.
 23. A mixture according to claim 22 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 24. A mixture according to claim 19 of symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of the compound of the formula ##STR14## and a compound of the formula ##STR15## the molar ratio of the former to the latter being 1:1, wherein M is hydrogen or a non-chromophoric cation, andthe negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation.
 25. A mixture according to claim 24 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 26. A mixture according to claim 15 of symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of the compound of the formula ##STR16## and a compound of the formula ##STR17## the molar ratio of the former to the latter being 1:1, wherein M is hydrogen or a non-chromophoric cation, andthe negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation.
 27. A mixture according to claim 26 whereinM is sodium, and the negative charge of the complex anion of each 1:2 cobalt complex is balanced by sodium.
 28. A mixture according to claim 15 of symmetrical and asymmetrical 1:2 cobalt complexes of a mixture of the compound of the formula ##STR18## and a compound of the formula ##STR19## the molar ratio of the former to the latter being 1:1, wherein M is hydrogen or a non-chromophoric cation, andthe negative charge of the complex anion of each 1:2 cobalt complex is balanced by hydrogen or a non-chromophoric cation. 